var pi = 3.14159265358979324;
var a = 6378245.0;
var ee = 0.00669342162296594323;

/*判断是否在国内，不在国内则不做偏移*/
function outOfChina(lon, lat) {
  if ((lon < 72.004 || lon > 137.8347) && (lat < 0.8293 || lat > 55.8271)) {
    return true;
  } else {
    return false;
  }
}

function transformLat(x, y) {
  var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
  ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
  ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
  return ret;
}

function transformLon(x, y) {
  var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
  ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
  return ret;
}

export const transformWGS2GCJ = (wgLat, wgLon) => {
  var mars_point = {lon: 0, lat: 0};
  // if (outOfChina(wgLat, wgLon)) {
  //   console.log(wgLat, wgLon)
  //   mars_point.lat = wgLat;
  //   mars_point.lon = wgLon;
  //   return;
  // }
  // console.log(123111)

  var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
  var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
  var radLat = wgLat / 180.0 * pi;
  var magic = Math.sin(radLat);
  magic = 1 - ee * magic * magic;
  var sqrtMagic = Math.sqrt(magic);
  dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
  dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
  mars_point.lat = wgLat + dLat;
  mars_point.lon = wgLon + dLon;
  return mars_point
}

